Method for making organic polycarboxylic acids
US4128574A · kind A · utility
27Cited by
1References
11Claims
0Family size
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Key dates
| Filing date | Oct 4, 1976 |
| Grant date | Dec 5, 1978 |
| Priority date | — |
| Expiry date | Oct 4, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D209/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is described for making organic polycarboxylic acids or anhydrides, such as aromatic ether bis(phthalic acid)s, based on a cyclic imide-cyclic anhydride exchange reaction at elevated temperatures in the presence of water. In addition to making organic polycarboxylic acid, organic imides are also generated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.